cp's OEIS Frontend

This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.

Showing 1-3 of 3 results.

A276608 a(n) = A276607(n) / 2.

Original entry on oeis.org

2, 4, 5, 10, 8, 12, 19, 10, 17, 20, 18, 11, 17, 26, 26, 21, 22, 24, 24, 27, 12, 32, 37, 29, 20, 11, 32, 23, 45, 29, 33, 28, 44, 23, 20, 8, 57, 67, 16, 43, 12, 27, 34, 14, 28, 29, 43, 44, 54, 26, 28, 66, 32, 30, 74, 14, 29, 28, 60, 22, 19, 76, 36, 28, 46, 49, 48, 19, 28, 44, 19, 23, 46, 90, 20, 40, 27, 63, 28, 31, 30, 43, 50
Offset: 1

Views

Author

Antti Karttunen, Sep 13 2016

Keywords

Links

Crossrefs

Cf. A276607, A276620.

Programs

Formula

a(n) = A276607(n) / 2.

A276620 Square array A(row,col) = A276610(row,col+1) - A276610(row,col): the first differences of each row of array A276610, read by descending antidiagonals as A(1,1), A(1,2), A(2,1), A(1,3), A(2,2), A(3,1), ...

Original entry on oeis.org

4, 4, 8, 4, 10, 10, 4, 8, 12, 20, 4, 10, 12, 20, 16, 4, 8, 12, 22, 12, 24, 4, 10, 10, 24, 16, 26, 38, 4, 8, 10, 24, 14, 30, 40, 20, 4, 10, 14, 22, 14, 20, 38, 18, 34, 4, 8, 10, 16, 12, 32, 34, 14, 22, 40, 4, 10, 10, 22, 20, 26, 38, 22, 34, 68, 36, 4, 8, 12, 28, 14, 18, 40, 14, 26, 46, 36, 22, 4, 10, 12, 20, 8, 30, 48, 12, 30, 74, 28, 14, 34
Offset: 1

Views

Author

Antti Karttunen, Sep 13 2016

Keywords

Comments

The first negative term occurs as a(490) = A(25,7) = A276610(25,8) - A276610(25,7) = 248 - 258 = -10.

Examples

			The top left 18 x 16 corner of the array:
   4,  4,  4,  4,  4,  4,  4,  4,  4,  4,  4,  4,  4,  4,  4,  4,  4,  4
   8, 10,  8, 10,  8, 10,  8, 10,  8, 10,  8, 10,  8, 10,  8, 10,  8, 10
  10, 12, 12, 12, 10, 10, 14, 10, 10, 12, 12, 12, 10, 10, 14, 10, 10, 12
  20, 20, 22, 24, 24, 22, 16, 22, 28, 20, 22, 20, 20, 26, 20, 22, 24, 22
  16, 12, 16, 14, 14, 12, 20, 14,  8, 22, 12, 12, 18, 12, 12, 18, 14, 14
  24, 26, 30, 20, 32, 26, 18, 30, 28, 22, 28, 30, 28, 20, 30, 24, 28, 26
  38, 40, 38, 34, 38, 40, 48, 34, 32, 40, 40, 36, 40, 44, 36, 40, 36, 32
  20, 18, 14, 22, 14, 12, 20, 22, 20, 16, 18, 12, 20, 10, 24, 18, 18, 18
  34, 22, 34, 26, 30, 40, 20, 30, 30, 32, 28, 34, 26, 40, 26, 26, 30, 32
  40, 68, 46, 74, 52, 48, 70, 40, 64, 66, 46, 58, 58, 48, 58, 62, 58, 52
  36, 36, 28, 32, 30, 28, 18, 58, 28, 20, 38, 26, 30, 50, 30, 28, 22, 44
  22, 14, 14, 10, 46, 16, 24,  2, 32, 16, 24, 20, 18, 12, 28, 12, 30, 20
  34, 32, 46, 32, 16, 46, 30, 30, 30, 54, 34, 26, 34, 26, 30, 38, 40, 18
  52, 44, 40, 52, 40, 56, 58, 60, 28, 24, 64, 52, 54, 66, 30, 54, 30, 66
  52, 74, 70, 52, 66, 68, 56, 52, 80, 64, 42, 90, 54, 42, 78, 58, 72, 68
  42, 46, 58, 64, 38, 38, 62, 52, 44, 62, 52, 28, 62, 52, 50, 50, 42, 52

Links

Crossrefs

Transpose: A276619.
Column 1: A276607.
Cf. A276610, A255127.

Programs

Formula

A(row,col) = A276610(row,col+1) - A276610(row,col).

A276606 First differences of postludic numbers: a(n) = A254100(1+n) - A254100(n).

Original entry on oeis.org

5, 10, 12, 24, 18, 28, 44, 22, 38, 48, 40, 24, 38, 58, 60, 48, 48, 54, 54, 60, 26, 70, 84, 66, 44, 24, 70, 50, 102, 64, 74, 60, 100, 48, 44, 18, 126, 150, 34, 96, 26, 58, 74, 30, 60, 66, 96, 96, 120, 58, 60, 146, 70, 66, 164, 30, 64, 60, 132, 50, 40, 168, 78, 62, 100, 108, 104, 42, 58, 98, 40, 50, 100, 198, 44, 88, 60, 138, 60
Offset: 1

Views

Author

Antti Karttunen, Sep 13 2016

Keywords

Links

Crossrefs

Column 2 of A276610.
Cf. also A260723, A276607.

Programs

Formula

a(n) = A254100(1+n) - A254100(n).
a(n) = A260723(1+n) + A276607(n).
Showing 1-3 of 3 results.

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